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| n | a(n) |
|---|---|
| 0 | 21 |
| 1 | 85766121 |
| 2 | 350277500542221 |
| 3 | 1430568690241985328321 |
| 4 | 5842587018385982521381124421 |
| 5 | 23861715484377209601555171628930521 |
| 6 | 97453656071460446110921078004886769746621 |
| 7 | 398010574215107679422058885600836061208944572721 |
| 8 | 1625515384162495488635310116741260158419511738394408821 |
[21,85766121,350277500542221, 1430568690241985328321, 5842587018385982521381124421, 23861715484377209601555171628930521, 97453656071460446110921078004886769746621, 398010574215107679422058885600836061208944572721, 16255153841624954886353101167412601584195117383944\ 08821] |